Guidelines for Using the Privacy Mechanism for SIP
RFC 5379

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Independent Submission                                       M. Munakata
Request for Comments: 5379                                   S. Schubert
Category: Informational                                          T. Ohba
ISSN: 2070-1721                                                      NTT
                                                           February 2010

           Guidelines for Using the Privacy Mechanism for SIP

Abstract

   This is an informational document that provides guidelines for using
   the privacy mechanism for the Session Initiation Protocol (SIP) that
   is specified in RFC 3323 and subsequently extended in RFCs 3325 and
   4244.  It is intended to clarify the handling of the target SIP
   headers/parameters and the Session Description Protocol (SDP)
   parameters for each of the privacy header values (priv-values).

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This is a contribution to the RFC Series, independently of any other
   RFC stream.  The RFC Editor has chosen to publish this document at
   its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5379.

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.

Munakata                      Informational                     [Page 1]
RFC 5379                 SIP Privacy Guidelines            February 2010

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................3
   3. Semantics of Existing priv-values ...............................4
   4. Target for Each priv-value ......................................5
      4.1. Target SIP Headers for Each priv-value .....................5
      4.2. Target SDP Parameters for Each priv-value ..................6
      4.3. Treatment of priv-value Not Supported by the
           Privacy Service ............................................7
   5. Recommended Treatment of User-Privacy-Sensitive Information .....7
      5.1. Target SIP Headers .........................................7
           5.1.1. Call-ID .............................................7
           5.1.2. Call-Info ...........................................8
           5.1.3. Contact .............................................8
           5.1.4. From ................................................9
           5.1.5. History-Info .......................................10
           5.1.6. In-Reply-To ........................................10
           5.1.7. Organization .......................................11
           5.1.8. P-Asserted-Identity ................................11
           5.1.9. Record-Route .......................................12
           5.1.10. Referred-By .......................................13
           5.1.11. Reply-To ..........................................14
           5.1.12. Server ............................................14
           5.1.13. Subject ...........................................15
           5.1.14. User-Agent ........................................15
           5.1.15. Via ...............................................15
           5.1.16. Warning ...........................................16
      5.2. Target SDP Parameters .....................................16
           5.2.1. c/m Lines ..........................................16
           5.2.2. o Line .............................................17
           5.2.3. i/u/e/p Lines ......................................17
      5.3. Considerations for Non-Target SIP Headers/Parameters ......17
           5.3.1. Identity/Identity-Info .............................17
           5.3.2. Path ...............................................18
           5.3.3. Replaces Header/Parameter ..........................18
           5.3.4. Route ..............................................21
           5.3.5. Service-Route ......................................21
           5.3.6. Target-Dialog ......................................21
   6. Security Considerations ........................................21
   7. Acknowledgements ...............................................22